(PHP 4 >= 4.0.5, PHP 5, PHP 7) Get numeric formatting information

(PECL bbcode >= 0.9.0) Parse a string following a given rule set

(PHP 5 >= 5.3.0, PHP 7) Convert a 8 bit string to a quoted-printable string

(PHP 4, PHP 5, PHP 7) Find the last occurrence of a character in a string

(PHP 4, PHP 5, PHP 7) Binary safe case-insensitive string comparison

(PHP 4, PHP 5, PHP 7) Perform a global regular expression match

(PHP 7) Perform a regular expression search and replace using callbacks

(PHP 4, PHP 5, PHP 7) Make a string lowercase

(PHP 4, PHP 5, PHP 7) Uppercase the first character of each word in a string

(PHP 4, PHP 5, PHP 7) Return information about characters used in a string